Question

The following code

class MemberException extends ServerException {
  String message;
  MemberException(message) {
    super(message);
  }
}

class ServerException implements Exception {
  String message;
  ServerException(this.message);
}

produces the following (somewhat unhelpful) error message

Too few arguments in implicit super() constructor invocation in '(String) -> dynamic'

Answer 1

The correct format is:

class MemberException extends ServerException {
  String message;
  MemberException(message) : super(message) {
    // constructor body
  }
}

You need to initialize super before the constructor body is called.
Ref: http://www.dartlang.org/docs/dart-up-and-running/contents/ch02.html#ch02-constructors (see the part on initializers)